Having lived in CO for 43 years, I\'ve ridden the 15 on and off for what seems like forever. It is the ultimate bus to observe people--from blue-collar workers to recently released folks from jail or gang-bangers or gang-banger wannabes, to homeless just trying to either (a) stay warm or (b) do something when there\'s nothing to do for free. There\'s always somebody to listen to or observe, it\'s never a boring ride! And sometimes the bus driver is really nice and helpful when needed.